/*
 * Copyright (c) 1998, 2005, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
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 *
 */

package javax.swing.plaf.basic;

import java.awt.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.plaf.*;
import java.awt.*;
import java.awt.event.*;


/**
 * BasicPanel implementation
 *
 * @author Steve Wilson
 */
public class BasicPanelUI extends PanelUI {

  // Shared UI object
  private static PanelUI panelUI;

  public static ComponentUI createUI(JComponent c) {
    if (panelUI == null) {
      panelUI = new BasicPanelUI();
    }
    return panelUI;
  }

  public void installUI(JComponent c) {
    JPanel p = (JPanel) c;
    super.installUI(p);
    installDefaults(p);
  }

  public void uninstallUI(JComponent c) {
    JPanel p = (JPanel) c;
    uninstallDefaults(p);
    super.uninstallUI(c);
  }

  protected void installDefaults(JPanel p) {
    LookAndFeel.installColorsAndFont(p,
        "Panel.background",
        "Panel.foreground",
        "Panel.font");
    LookAndFeel.installBorder(p, "Panel.border");
    LookAndFeel.installProperty(p, "opaque", Boolean.TRUE);
  }

  protected void uninstallDefaults(JPanel p) {
    LookAndFeel.uninstallBorder(p);
  }


  /**
   * Returns the baseline.
   *
   * @throws NullPointerException {@inheritDoc}
   * @throws IllegalArgumentException {@inheritDoc}
   * @see javax.swing.JComponent#getBaseline(int, int)
   * @since 1.6
   */
  public int getBaseline(JComponent c, int width, int height) {
    super.getBaseline(c, width, height);
    Border border = c.getBorder();
    if (border instanceof AbstractBorder) {
      return ((AbstractBorder) border).getBaseline(c, width, height);
    }
    return -1;
  }

  /**
   * Returns an enum indicating how the baseline of the component
   * changes as the size changes.
   *
   * @throws NullPointerException {@inheritDoc}
   * @see javax.swing.JComponent#getBaseline(int, int)
   * @since 1.6
   */
  public Component.BaselineResizeBehavior getBaselineResizeBehavior(
      JComponent c) {
    super.getBaselineResizeBehavior(c);
    Border border = c.getBorder();
    if (border instanceof AbstractBorder) {
      return ((AbstractBorder) border).getBaselineResizeBehavior(c);
    }
    return Component.BaselineResizeBehavior.OTHER;
  }
}
